KR20080093830A - Dryer - Google Patents

Abstract

A dryer is provided to display variable heating values or the degree of clogging of a vent duct while drying laundry so that a user can adjust heating values according to the clogging state of the vent duct, thereby improving power efficiency. A method for controlling a dryer comprises the steps of: starting a dry process(S11); judging the clogging state of a vent duct(S12); adjusting a heating value applied to the vent duct in at least three stages according to the degree of clogging of the vent duct(S14,S15); and displaying the adjusted-heating value.

Description

Dryer {DRYER}

1 is a cross-sectional view of a dryer according to the present invention.

2 is an exploded perspective view of a dryer according to the present invention.

3 is a partial cutaway view of a dryer according to the present invention.

4 is a block diagram of a dryer according to the present invention.

5 is an embodiment of the sensing circuit of FIG. 4.

6 and 7 are graphs of output waveforms of the sensing circuit.

8 is an on / off graph recognized by the microcomputer.

9 is a flow chart of a control method of a dryer according to the present invention.

<Description of the symbols for the main parts of the drawings>

30: heater 43: blowing fan

80: sensing circuit 72: motor

90: micom

The present invention relates to a dryer, and more particularly, to a dryer for controlling the amount of heat generated by the heater according to the degree of clogging of the air flow path.

In general, a dry washing machine includes a main body having a predetermined shape, a drum installed inside the main body, a toughness surrounding the drum and collecting wash water, a driving motor for rotating the drum, and a detergent container for injecting detergent. And a water supply pipe connected to the detergent container for supplying the washing water or the washing water mixed with the detergent of the detergent container, a drain pipe for discharging the washing water used in the washing stroke to the outside, and forcibly draining the washing water connected to the end of the drain pipe. It consists of pump and drain hose.

Such a washing machine having a drying function is to wash laundry by friction with the washing water generated by dropping the laundry feeling and washing water into the drum and the washing feeling falling in the direction of gravity when the drum is rotated. In recent years, such a drum washing machine has been added to its function to dry not only laundry but also dry laundry by hot air.

The dry washing machine as described above may be further divided into condensation type and exhaust type, and the condensation type sends heat generated by the heater to the drum side by a blowing fan to dry the laundry in the drum. At this time, the air in the drum drying the laundry is in a high temperature and high humidity state and is moved to the exhaust port communicating with the tub. At this time, a nozzle for injecting cold water is installed at one side of the exhaust port to remove moisture from the high temperature and high humidity air to supply dry air to the blower fan again.

In the exhaust type, the hot air generated by the heater and the blowing fan passes through the washing in the drum, and then the hot air is discharged to the outside of the washing machine through the exhaust port formed at one side of the washing machine. Here, the exhaust port is connected by a corrugated hose that is connected to the tough, the exhaust port serves as a pore when the infant or pet is trapped in the washing machine.

In such a washing machine having an exhaust type drying function, lint (fine lint) is generated in the dryness of the laundry. The lint circulates along the hot air from the drum in the washing machine and is discharged out of the washing machine along the exhaust port.

Lint filter in the exhaust port to prevent lint from blocking the exhaust port due to long-term use of the washing machine by providing a structure that can collect the lint regularly so that lint generated from the feeling of washing after washing does not accumulate in the exhaust outlet discharged to the outside of the washing machine Is fitted.

As the dryer according to the related art performs drying, the degree of clogging of the exhaust port and the filter is increased, and thus, the drying time is increased and the power consumption is increased.

It is an object of the present invention to provide a dryer and a control method thereof in which power consumption is optimized when drying by heating such as a heater.

In addition, an object of the present invention is to provide a dryer and a control method thereof for adjusting the calorific value during the drying operation according to the degree of clogging of the air flow path.

In addition, an object of the present invention is to provide a dryer and a control method thereof for displaying a variable calorific value or a degree of blockage of an air flow path during a drying operation.

In the following, the invention is explained in detail by taking a dryer as an example based on the embodiments of the invention and the accompanying drawings. However, the scope of the present invention is not limited by the following examples and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

1 is a cross-sectional view of a dryer according to the present invention, Figure 2 is an exploded perspective view of the dryer according to the present invention, Figure 3 is a partial cutaway view of the dryer according to the present invention. The present invention uses the exhaust type dryer as an embodiment, but is not necessarily limited to the exhaust type dryer.

As shown in FIG. 1, the exhaust type dryer according to the present embodiment includes a drum 10 disposed inside the cabinet 1 to accommodate a fabric and a suction flow path 20 installed to suck air into the drum 10. And a heater 30 provided on the suction passage 20 and an exhaust passage 40 installed so that the air passing through the drum 10 is exhausted to the outside of the cabinet 1. In addition, when the exhaust type dryer is installed, an external exhaust duct 50 coupled to the exhaust flow passage 40 and passing through the inner wall 60 of the building and the like to exhaust the air to the outside is installed.

The blower fan 43 is provided on one side of the suction passage 20 and the exhaust passage 40, and will be described below in that it is installed in the exhaust passage 40.

As shown in FIGS. 2 and 3, the cabinet 1 includes a base fan 2, a cabinet main body 3 installed on the upper side of the base fan 2, and a cabinet cover provided on the front of the cabinet main body 3. (4), a back panel (7) provided on the back of the cabinet body (3), a top cover (8) provided on the upper surface of the cabinet body (3), and a control panel (9) provided on the top of the cabinet cover (4). It is configured to include).

As shown in FIG. 2, the cabinet cover 4 is formed with a gun entry hole 5 so that the carriage drum 10 can enter and exit and a door 6 for opening and closing the gun entry hole 5 is rotated. Possibly connected. In addition, a control panel 9 is installed at the upper end of the cabinet cover 4. The control panel 9 includes an input unit 9a for acquiring a user's input, and a display unit for displaying the state of the dryer (for example, the drying progress state, the drying progress degree, the remaining drying time, the selection of the drying mode, etc.) 9b). Moreover, the front supporter 11 which mounts the back end of the drum 10 rotatably is mounted in the back of the cabinet cover 4.

In front of the back panel 7, a rear supporter 12 is mounted to support the rear end of the drum 10 in a rotatable manner. The rear supporter 12 is formed with a communication hole 13 for communicating the suction passage 20 and the inlet of the drum 10 so that air passing through the suction passage 20 can be sucked into the inlet of the drum 10. .

2 and 3, the drum 10 is a circular cylinder that is accommodated therein and opened in the front-rear direction so that air passes in the front-rear direction, and the rear opening forms the drum inlet, and the front opening is the drum. Form an outlet. The drum 10 is installed so that the lift 14 protrudes from the inner circumferential surface so that the fabric can be lifted and dropped during rotation.

The suction passage 20 is formed by a suction duct installed so that the lower end communicates with the rear end of the heater 30 and the upper end communicates with the communication hole 13 of the rear supporter 12.

As shown in FIGS. 2 and 3, the heater 30 is disposed on the upper surface of the base fan 2 and arranged in the heater case communicating with the suction passage 20, that is, the suction duct 20, and inside the heater case. When the power is supplied to the heating coil, the inner space of the heater case and the heater case are heated to heat the air passing through the inside of the heater case with high temperature and low humidity air.

As illustrated in FIGS. 2 and 3, the exhaust flow passage 40 is installed to communicate with the drum outlet so that air in the drum 10 may be exhausted, and may filter foreign matter such as seams in the exhausted air. A lint duct 42 having a lint filter 41 mounted thereon, a fan housing 44 communicating with the lint duct 42 and having a blower fan 43 built therein, and one end communicating with the fan housing 44 and the other end thereof. The other end is made by an exhaust pipe 46 extending out of the cabinet 1. The exhaust pipe 46 is connected to an external exhaust duct 50 for guiding outdoor air exhausted to the outside of the cabinet 1. The external exhaust duct is formed outside the cabinet 1 to direct air to the external space and can pass through the building inner wall 60.

The air flow path used in the present invention includes a suction flow path 20, an internal space of the drum 10, an exhaust flow path 40, and an external exhaust duct 50, and the clogging of the air flow path is the exhaust flow path 40. Mainly occurs in the lint filter 41 and the external exhaust duct 50. The degree of blockage of the air flow due to the blockage of the lint filter 41 of the exhaust flow path 40 is relatively smaller than the degree of blockage of the air flow due to the blockage of the external exhaust duct 50.

The operation of the exhaust dryer is an embodiment of the present invention is as follows.

First, after the cloth is introduced into the drum 10, the door 6 is closed, and the control panel 9 is operated to operate the exhaust dryer, and the exhaust dryer turns on the heater 30 and the motor. Drive 72.

When the heater 30 is turned on, the heater 30 heats the inside, and when the motor 72 is driven, the belt 70 and the blowing fan 43 rotate. When the belt 70 rotates, the drum 10 is rotated, and the artillery in the drum 10 is lifted up by the lift 14 and then repeatedly drops.

When the blowing fan 43 is rotated, air outside the cabinet 1 is sucked into the air suction hole 7a of the back cover 7 by the blowing force generated when the blowing fan 43 is rotated, and the cabinet 1 ) And the drum 10. The air between the cabinet 1 and the drum 10 changes into high temperature and low humidity as it enters the heater 30 and is heated, and thereafter, the drum passes through the communication hole 13 of the suction channel 20 and the rear supporter 12. It is sucked into the inside of 10.

The high temperature and low humidity air sucked into the drum 10 is brought into contact with the cloth while moving toward the front of the drum 10, and changes to high humidity. Then, the air is exhausted into the exhaust passage 40.

Air exhausted to the exhaust flow passage 40 passes through the exhaust pipe 46 as it is and is exhausted to the outside through the external exhaust duct 50.

4 is a block diagram of a dryer according to the present invention. The dryer shown in FIG. 4 receives external commercial power and supplies the heater 30 to the heater 30, wherein the dryer is turned on and off depending on the temperature of the heater 30 or the temperature of the air heated by the heater 30. 2 thermostat (TS1), (TS2) (hereinafter may also be referred to collectively as a 'temperature control member'), and on / off by the control command of the microcomputer 90 so that commercial power is applied to the heater 30 Switches SW1, SW2, input unit 9a, display unit 9b, heater 30, blower fan 43, motor 72, first and second thermostats The sensing circuit 80 determines whether to supply power to the heater 30 according to the on / off of TS1 and TS2, and the first and second thermostats according to the power supply state from the sensing circuit 80. TS1) and the microcomputer 90 for determining whether or not TS2 is operable. However, although a power supply unit for supplying a DC power source used for the microcomputer 90, the input unit 9a, the display unit 9b, and the like from a commercial power source is not shown, such a power supply unit is natural to those familiar with the technical field to which the present invention belongs. Is just a technique.

The first and second thermostats TS1 and TS2 are kinds of adjustment units according to a temperature, and are mounted on or near the heater 30 to be heated by the heater 30 or the temperature of the heater 30. In response to the temperature of the air, the on state is maintained before reaching the predetermined overheating temperature, and when the overheating temperature is exceeded, the state is turned off so that commercial power is not applied to the heater 30. In particular, the first thermostat TS1 does not return to the on state once it is turned off to complement the second thermostat TS2. The first and second thermostats TS1 and TS2 are mounted to the suction passage 20 connected to the heater 30, for example.

In addition, the heater 30 includes a first heat generating coil 30a and a second heat generating coil 30b mounted inside the heater case. However, the heater 30 may be composed of two heating coils as shown, it may be composed of more.

In addition, the switches SW1 and SW2 are constituted by elements such as relays, and maintain the on state during the drying operation according to the on control of the microcomputer 90, and the off state according to the off control of the microcomputer 90. The switch SW1 allows power to be applied to the first heat generating coil 30a, and the switch SW2 allows power to be applied to the second heat generating coil 30b. These switches SW1 and SW2 are turned on / off under the control of the microcomputer 90, whereby the amount of heat generated by the heater 30 is adjusted.

In addition, the input unit 9a receives a control command related to a drying operation from a user and applies it to the microcomputer 90.

In addition, the display unit 9b displays not only the input for the drying operation input by the user, the progress of the drying operation, the remaining time, but also the degree of blockage of the air flow path, the blocked portion, and the like. In the present specification, the air passage includes a suction passage 20, a drum 10, an exhaust passage 40, and an external exhaust duct 50, and in particular, the lint filter 41 and the external exhaust in the exhaust passage 40. It may also refer to the duct 50. In addition, the display unit 9b may display the amount of heat generated during the current drying operation. For example, when both of the first and second heat generating coils 30a and 30b generate heat, only one of the first and second heat generating coils 30a and 30b generates heat. In the case of 'middle', the first and second heat generating coils 30a and 30b may be variously displayed as letters or figures, such as 'low' or 'no fever' in a state in which both of them are turned off. .

The sensing circuit 80 is connected to the nodes N1 and N2, respectively, to determine whether a current flows through the series circuit including the heater 30, that is, whether power is supplied to the heater 30. For this determination, the sensing circuit 80 is connected to the nodes N1 and N2 by the connecting lines 80a and 80b, respectively. Since the sensing circuit 80 is mounted on the control panel 9 in which the microcomputer 90 is mounted, the connecting lines 80a and 80b are formed in the inner space between the drum 10 and the cabinet body 3 or in the cabinet body 3. Proceed along the inner surface of

More specifically, the sensing circuit 80 supplies power to the heater 30 by the on / off operation of the first and second thermostats TS1 and TS2 operating according to the temperature of the heater 30 or air. Is to determine if it is supplied. Of course, the power supply to the heater 30 is also controlled by the switches SW1 and SW2, but since the switches SW1 and SW2 operate under the control of the microcomputer 90, the microcomputer 90 switches SW1. , When SW2) is in the on state, confirms the power supply state according to the signal from the sensing circuit 80. When the switches SW1 and SW2 are turned off by the microcomputer 90, the microcomputer 90 does not consider the signal applied from the sensing circuit 80.

 The sensing circuit 80 applies different signals to the microcomputer 90 according to the power supply state, so that the microcomputer 90 can check the power supply state of the heater 30. Unlike FIG. 5, the input terminal of the sensing circuit 80 may be connected between the first thermostat TS1 and a commercial power source, respectively. In a series circuit consisting of a commercial power source, first and second thermostats TS1 and TS2, heater 30, and switches SW1 and SW2, the potential difference across heater 30 in response to the supply of commercial power. As can be most clearly identified, the sensing circuit 80 is always connected to sense the potential difference of the portion in which the heater 30 is included.

As described above, the microcomputer 90 basically controls the heater 30, the switches SW1 and SW2, and the motor 72 according to a command of the user through the input unit 9a, and the motor 72. Control the blower fan 43 through the control of the drying operation. In addition, the microcomputer 90 has a storage unit (not shown) for storing such a control algorithm, for example, the EEPROM may be used.

The microcomputer 90 and the sensing circuit 80 are mounted on the rear of the control panel 9 described above.

In addition, the microcomputer 90 determines information on power supply and shutdown by the first and second thermostats TS1 and TS2 according to the detection signal from the sensing circuit 80.

5 is an embodiment of the sensing circuit of FIG. 4. As shown in FIG. 5, the sensing circuit 80 depressurizes the diode D1 for applying a positive voltage from the input voltage from the node N1 and the input voltage from the node N1. The resistor R1, the noise preventing diode D2 and the capacitor C1 included in the input voltage applied to the input terminals I1 and I2 of the photo coupler PC, and the photo coupler turned on / off according to the input voltage And a different voltage waveform below the reference voltage Vref, which is a DC voltage, to the microcomputer 90 when the photo coupler PC is connected to the output terminal O1 of the photo coupler PC. It consists of a resistor R2 and a capacitor C2. The reference voltage Vref is used as a driving voltage of the microcomputer 90 in the circuit in which the microcomputer 90 is provided, and a description of the voltage supply unit generating the reference voltage Vref is omitted. The generation of Vref) is a technique easily recognized by a person familiar with the technical field to which the present invention belongs.

In particular, since the potential difference between the node N1 and N2 is about 240V when the commercial power source is AC 240V, for example, the resistor R1 is a photocoupler when the voltage is directly applied to the photocoupler PC. This is to reduce the input voltage to several tens of volts since the PC may be damaged.

In addition, the photo coupler PC has a potential difference between the node N1 and N2, that is, when the first and second thermostats TS1 and TS2 are turned on so that power is supplied to the heater 30. Since the voltage corresponding to the potential difference is applied to the input terminal, and this voltage is an AC voltage, the internal photodiode emits light according to the period of this voltage, and the transistor which is a light receiving part is turned on / off, and a square wave is applied to the microcomputer 90. do. If there is no potential difference between the nodes N1 and N2, that is, when the first or second thermostat TS1, TS2 is turned off so that power is not supplied to the heater 30, the input terminal of the sensing circuit 80 is turned off. Since the inside of the photodiode does not emit light, the transistor which is the light receiving part is turned off, and thus the DC voltage waveform close to the reference voltage Vref is continuously applied to the microcomputer 90.

6 and 7 are graphs of output waveforms of a sensing circuit. As shown in FIG. 6, when the first and second thermostats TS1 and TS2 are in an on state, commercial power that is AC is applied to the heater 30, so that the nodes N1 and N2 A voltage difference of a magnitude corresponding to this commercial power source is caused, and the photo coupler PC is turned on according to the voltage difference, but since the AC voltage is applied, the photo coupler PC is repeatedly turned on and off in response to the cycle of the commercial power source. The square wave smaller than the reference voltage Vref is applied to the microcomputer 90.

As shown in FIG. 7, when the first or second thermostats TS1 and TS2 are in an off state, power is not supplied to the heater 30, and the nodes N1 and N2 are coincident with each other. As a result, the photo coupler PC is always turned off, and a DC voltage (for example, a high signal) close to the reference voltage Vref is applied to the microcomputer 90.

Accordingly, the microcomputer 90 may calculate the power cutoff time to the heater 30 due to the OFF state of the first and second thermostats TS1 and TS2 according to the waveform of the DC voltage applied thereto.

8 is an on / off graph recognized by the microcomputer. FIG. 8 is on / off graphs recognized by the microcomputer of FIG. 5. In Figure 8, R means the diameter of the exhaust duct 50, the unit of the number is inches. That is, when the diameter is R (2.0), R (2.3), R (2.625), R (2.88), R (3.0), the microcomputer (according to the signal from the sensing circuit 80 as shown in Figs. 90 indicates on / off of the power supply state to the heater 30 recognized. The larger the diameter, the weaker the state of the air flow path (degree of blockage), and the narrower the diameter, the more severe the state of the air flow path (degree of blockage).

In order to determine the blocked state of the air flow path, a method of calculating and confirming an on / off duty ratio of a power supply is disclosed. In this embodiment, both the on duty ratio (x '/ y') and the off duty ratio (z '/ y') may be used, and only one of them may be used. The off duty ratio z '/ y' is described below.

First, the off duty ratio of R (2.0) is 0.48 (on duty ratio is 0.52), the off duty ratio of R (2.3) is 0.32 (on duty ratio is 0.68), and the off duty ratio of R (2.625) is 0.26. (The on duty ratio is 0.74), the off duty ratio of R (2.88) is 0.13 (the on duty ratio is 0.87), and the off duty ratio of R (3.0) is 0 (the on duty ratio is 1). That is, it can be seen that the off duty ratio increases as the diameter decreases. The on duty ratio is relatively reduced. Therefore, the microcomputer 90 may calculate the off duty ratio to determine the degree of blockage of the current air flow path (in particular, the blockage of the lint filter 41 or the blockage state of the exhaust duct 50). These experimental results can be summarized as shown in Table 1 below.

Off duty ratio Degree of blockage Blockage 0-0.30 - - 0.30-0.45 Low (weak) Lint filter 0.45-0.60 Medium Lint filter (severe blockage) / exhaust duct (medium blockage) 0.60 ~ Severe Exhaust duct

The microcomputer 90 stores the blockage information of the air flow path including a blockage degree of the on / off duty ratio and the like described above. This storage is made corresponding to the number of drying operations of the dryer. In particular, when the dryer 1 is first installed or reinstalled by moving, the microcomputer 90 stores the initial blockage of the air flow path, more precisely, the degree of initial blockage of the exhaust duct 50, and then the drying. The degree of blockage according to the performance of the operation is additionally stored. For example, the initial blockage degree D0 stored by the microcomputer 90 is stored, and the blockage degree thereafter is stored as D1, D2, ..., Dn-1, Dn.

9 is a flow chart of a control method of a dryer according to the present invention.

In detail, in step S11, the microcomputer 90 starts a drying operation according to a user's control input through the input unit 9a. Accordingly, the microcomputer 90 turns on the switches SW1 and SW2 and drives the motor 72 so that the drying operation is performed. The microcomputer 90 may display the amount of heat generated in the current drying operation through the display unit 9b.

In step S12, as described above, the microcomputer 90 determines the degree of clogging of the exhaust duct 50 using the on / off duty ratio of the temperature adjusting member.

In step S13, the microcomputer 90 determines whether the determined degree of clogging of the exhaust duct 50 is greater than the reference degree (eg, the off-duty ratio is 0.60). If the determined degree of blockage is greater than the reference degree, the temperature control member is excessively turned on / off according to the current amount of heat generated by the heater 30 and the degree of blockage of the exhaust duct 50, and thus the drying operation is not performed smoothly. Therefore, the flow advances to step S14. If the determined degree of blockage is less than or equal to the reference level, since the temperature control member operates normally according to the amount of heat generated by the current heater 30 and the degree of blockage of the exhaust duct 50, the drying operation is smoothly performed. Proceed to S15.

In step S14, the microcomputer 90 reduces the amount of heat generated by the heater 30. In this embodiment, the microcomputer 90 turns off the switch SW1 so that the heat generation amount is reduced by half. The microcomputer 90 may display the reduced heat generation amount in the current drying operation through the display unit 9b.

In step S15, the microcomputer 90 maintains the amount of heat generated by the heater 30 as it is. That is, by turning on the switches SW1 and SW2, the drying operation by the current heat generation amount is performed. The microcomputer 90 may display the amount of heat generated in the current drying operation through the display unit 9b.

Steps S12 to S15 described above are repeatedly performed until the drying operation is completed, thereby adjusting the amount of heat generated by the heater 30 during the drying operation.

In the above-described embodiment, the dryer 1 controlled the supply of power applied to the heating coils 30a and 30b, respectively, using the switches SW1 and SW2. In addition to this method, the dryer 1 further includes a power control unit for adjusting the size of the power applied to the heater 30, so that the microcomputer 90 increases or decreases the size of the power supplied to the heater 30. The amount of heat generated in 30 may also be adjusted.

However, the scope of the present invention is not limited by the above embodiments and drawings.

In the following, various aspects of the claimable invention are described. The following description forms a part of the detailed description of the present invention, and is a minimum of examples of the technical idea of the present invention which can be grasped from various viewpoints or examples of the dryer and the method of controlling the dryer according to the present invention. It is to be understood as a description of and not as a boundary limiting the present invention.

The dryer of the present invention as claimed in claim 1 of the present invention comprises a power supply unit to which commercial power is applied, a heater unit for controlling the amount of heat generated, and a control unit for adjusting the amount of heat generated by the heater unit according to the blocked state of the air channel, thereby blocking the air channel. The heat generation according to the state and degree of clogging improves the efficiency of power consumption.

At the time of filing, the heater unit according to claim 2 comprises at least one heating coil and at least one switch for applying commercial power to each heating coil under the control of the control unit, so that the control unit controls the amount of heat generated by the heating coil. Can be.

At the time of filing, the heater unit according to claim 3 operates in at least three stages of individual heating values, and the heating value is controlled according to the state of the air flow path.

The dryer according to claim 4 of the present application is provided with a determination unit for determining a blocked state of the air flow path, so as to accurately determine the blocked state of the air flow path, so that the heating value control is performed accordingly.

The dryer according to claim 5 of the present application has a display unit which displays the adjusted calorific value of the heater unit, so that the user can check the current calorific value.

The drying machine according to claim 6 of the claims at the time of application is provided with a display unit for indicating the blocked state of the air flow path, so that the user can check the blocked state of the air flow path.

The control method of the dryer according to claim 7, wherein the method for controlling a dryer comprises: starting a drying operation, determining a blocked state of the air flow path, and adjusting a calorific value applied to the air flow path according to the determined blocked state. It improves the efficiency of power consumption.

The adjustment step according to claim 8 of the application claims to adjust the calorific value according to the individual calorific value of at least three or more steps.

The control method according to claim 9 at the time of filing includes displaying the adjusted calorific value.

The control method according to claim 10 at the time of filing includes displaying the determined blocked state.

The present invention has the effect of optimizing power consumption during drying by heat generation such as a heater.

In addition, the present invention has the effect of adjusting the amount of heat generated during the drying operation according to the degree of clogging of the air flow path.

In addition, the present invention displays a variable heating value or clogging degree of the air flow path during the drying operation, so that the user can quickly and easily obtain information about this.

Claims (10)

A power supply unit receiving commercial power; A heater unit in which heat generation amount is adjusted; Dryer, characterized in that the control unit for adjusting the amount of heat generated in the heater according to the blocked state of the air flow path. The method of claim 1, And a heater unit comprising at least one heating coil and at least one switch for applying commercial power to each heating coil under the control of a controller. The method of claim 1, Dryer characterized in that the heater unit operates at least three steps of individual heat generation. The method of claim 1, Dryer is provided with a determining unit for determining the blocked state of the air flow path. The method of claim 1, The dryer includes a display unit for displaying the adjusted calorific value of the heater unit. The method according to any one of claims 1 to 5, The dryer includes a display unit which displays a state of blocking of the air flow path. Initiating a drying operation; Determining a blocked state of the air flow path; And controlling the calorific value applied to the air flow path according to the determined clogging state. The method of claim 7, wherein The control step is a control method of the dryer, characterized in that for controlling the calorific value according to the individual calorific value of at least three or more steps. The method of claim 7, wherein The control method includes the step of displaying the adjusted calorific value. The method according to any one of claims 7 to 9, The control method includes controlling the determined clogging state.

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